TIDM-02013: PFC topology

Alihussain Vohra

Prodigy 60 points

Part Number: TIDM-02013

Hi,

There are 2 totem pole topologies.

1. interleave totem pole (used in TIDm-02013)

2. Totem-Pole Bridgeless PFC (Diode Rectification)

My question is can we use Totem-Pole Bridgeless PFC (Diode Rectification) for bidirectional OBC?

over 1 year ago

0 Cody Watkins over 1 year ago

TI__Mastermind 42195 points

BL TotemPole PFCs(TTPLPFC) can operate in both directions. Diode rectifiers can support PFC action in a BL TTPLPFC. This is because the diodes will be forward biased in this mode.

To answer your question please consider the power flow when in reverse conduction. Figure 4 of the following IEEE paper shows the power flow in a V2G application. The synchronous rectifier FETs are reverse biased in this case. If you replace these with diodes the current will be blocked, and rectification cannot occur.

https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7467909&tag=1

Regards,
Cody

0 Alihussain Vohra over 1 year ago in reply to Cody Watkins

Prodigy 60 points

Thanks Cody.

If you can share the IEEE screenshot here which you are referring to.

+1 Cody Watkins over 1 year ago in reply to Alihussain Vohra

TI__Mastermind 42195 points

Alihussain,

I do not believe I can share that directly if it is not in the public domain. It shows current flowing in the reverse direction across the switch. This must happen as power is leaving the battery and going to a load/grid in a V2G application.

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TIDM-02013: PFC topology